故选B。【15题详解】考查动词。分析句子可知，句中缺少谓语动词，根据文章可知用一般过去时。句意：一年后，他发明了一种方法。故选F。【16题详解】考查动词。根据前面的is可知，这里用过去分词形式。句意：然后再把随后的几层打印上去，直到最后完成。故选H。【17题详解】考查副词。根据句意可知，这里用副词修饰整个句子。句意：这项发明申请专利后，他创立了3D系统公司，最终从一位加拿大投资者那里获得了600万美元（350万英镑）的投资。故选G。【18题详解】考查形容词。修饰名词product，用形容词修饰。句意：首件商业化产品于1988年出炉。故选J。【19题详解】考查名词。介词to后接名词形式。句意：这种技术可利用的价值似乎是无穷的从家用打精英学习计划页脚内容
fk12小初高学习小初高学习印食品和药品，到从商店里拍下瓷器的照片，然后用从互联网上下载的图纸重新制作的建议。故选E。【20题详解】考查副词。修饰过去分词spoke
，前用副词形式。句意：尽管他的反应审慎持重但有那么一刻轻声细语的查克赫尔还是显出了他对自己的发明到底能够取得什么样的成果感到吃惊。故选K。IIIReadi
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